Cadillac 2015 ATS Owner's Manual page 308

Additional Maintenance Every
30 000 km or 2 Years
In addition to the items listed under
Inspection Every 15 000 km or
1 Year the following items should
be carried out every 30 000 km or
2 years (whichever occurs first):
Passenger compartment air filter
replace (if applicable).
Engine air filter replacement.
Replace Every 2 Years
Note: All vehicles with rear-wheel
drive change driveline axle oil
every 30 000 km, if vehicle is used
for towing purposes.
Additional Maintenance Every
72 000 km
All-wheel-drive vehicles only:
Transfer case fluid change
(severe service) for vehicles
mainly driven in heavy city traffic
in hot weather, in hilly or
mountainous terrain, when
frequently towing a trailer,
or when used for taxi, police,
or delivery service. During any
maintenance, if a power washer
is used to clean mud and dirt
from the underbody, care should
be taken to not directly spray
the transfer case output seals.
High pressure water can
overcome the seals and
contaminate the transfer case
fluid. Contaminated fluid will
decrease the life of the transfer
case and should be replaced.
Automatic transmission fluid and
filter change (severe service) for
vehicles mainly driven in heavy
city traffic in hot weather, in hilly
or mountainous terrain, when
frequently towing a trailer,
or when used for taxi, police,
or delivery service.
Rear axle fluid replace,
if equipped with limited slip
differential.
Replace brake fluid. Or every
three years, whichever occurs
first.
Service and Maintenance
Additional Maintenance Every
96 000 km
Spark plugs
Additional Maintenance Every
250 000 km
Engine cooling system drain and
refill. Or every five years,
whichever occurs first.
Conditions Requiring More
Frequent Maintenance (Severe
Service)
Extreme temperatures.
Heavy city traffic.
Hilly or mountainous terrain.
Dusty, muddy, or off-road
conditions.
Commercial use or trailer towing.
Most trips less than 6 km.
11-3
replace.